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Transmits 10pps/20pps dial pulse by a open/close action between Tip and Ring with Photo MOS relay.
The make width, break width and inter digital width for 10pps/20pps can be set respectively.
When making, 37pin (DIAL [0]) of IC203 becomes Low level, and RL3 turns ON. When breaking, 37pin (DIAL [0]) of IC203
becomes High level, and RL3 turns OFF.
It provides the SHUNT control function for the stabilization of line power depending on the destination. Turning ON PC5 when trans-
mitting pulse reduces the impedance at making, and stabilizes the line power.

Making CODEC (e.g. pin-37 of IC203, DIAL [0]) Low level, the photo MOS relay (RL3) turns ON and the line is acquired.
It is used in common as Dial Pulse transmitting circuit.
DC Loop Path :

• Ring

→L1→D1→D2→J7→D3→RL3→Q4 (C-E)→R14→D3→L1→TH1→Tip

• Tip

→TH1→L1→D3→R14→Q4 (C-E)→RL3→D3→J7→D2→D1→L1→Ring

10

This transmits the DTMF signal on the highway timeslot. The different DTMF signals can be transmitted to the optional ports at the
same time.
They are transmitted to the line through CODEC.

During on-hook, transmitting the bell signal to the AC loop in the CR series circuits (C2 and R2) detects the current by Photo Cou-
pler (PC1,2), and it determines the presence of a bell signal. Software performs the operation for recognition and determination of a
pattern of bell signals.
Bell loop path

• Ring

→L1→R2→PC1 (1-2)→C3→R5→L1→TH1→Tip

In this path, PC1 4-pin converts from High to Low, and a bell signal is detected.

• Tip

→TH1→L1→R5→C3→PC2 (1-2)→R2→L1→Ring

In this path, PC2 4-pin converts from High to Low, and a bell signal is detected.

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This is detected by the photo coupler (pin 4 of PC1 and PC2) at part of making DC loop. PC1(PC2) 4-pin is High level during a call.
However, at end-call, PC1(PC2) 4-pin converts from High to Low.
It detects an end-call with measuring of the signal width of Low level by CODEC (e.g. pin 39 of IC203, REVDET/ pin 38 of IC203,
BELLI).
The available setting values for detection width are none, 0.5msec-8msec(at 2msec intervals) and 16~896msec(at 8msec inter-
vals).

Configured by the photo couplers (PC1, PC2) that enable to detect each current in Tip

→Ring, Ring→Tip direction. (PC2 is used in

common as the bell detection photo coupler). Using Software, it stores the current direction (the detected photo coupler) at acquir-
ing line and recognizes the action by changing of the current direction (the detected photo coupler changes).

When the current flows in the direction of Ring to Tip, 4-pin of PC1 is Low and 4-pin of PC2 is High.

• Ring

→L1→R2→PC1 (1-2)→D3→RL3→Q4 (C-E)→R14→D3→L1→J2→L1→TH1→Tip

When the current direction (polarity) is reversed from Tip to Ring, 4-pin of PC1 turns to High and 4-pin of PC2 turns to Low. It recog-
nizes the action by changing of the current direction (the detected photo coupler changes).

• Tip

→TH1→L1→D3→R14→Q4 (C-E)→RL3→D3→PC2 (1-2)→R2→L1→Ring

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This converts 4W-voice signal inside PBX and 2W-voice signal on SLT line. It is configured by Op-Amp in HIC and BN (Balance
Network) in CODEC. It determines the return loss of voice and the frequency characteristic, and it can match with all sorts of imped-
ance by changing the programs of CODEC.

A dedicated interface, which can connect PEB2466 by Infineon up to 2, for enabling circuit controls.